Wifi network failing, but Chrome is fine!

Hi,
I've recently started to have terrible problems with my wifi network: i thought perhaps i was losing internet connectivity, but this is not the case.
All i can say is that periodically my internet apps lose connection, and then i will notice i've lost network connection.
Eventually, some of it is restored, but this time i noticed something interesting: I can use Chrome fine, I can now see my network, but apps such as Slack and Safari are totally failing to connect.
This is a brand new Macbook Pro with16GB Ram, a 521MB SSD, and the latest Yosemite OS (10.10.4 14C109)
From my perusing, i noticed that often a log is requested from EtreCheck, so I include one here in advance, taking whilst Chrome is working but Safari etc are not.
Thanks
-Mark
Problem description:
No network over wifi : Chrome is working ok, but Safari is failing as is Slack
EtreCheck version: 2.1.7 (114)
Report generated 30 January 2015 13:45:08 GMT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Support] links for help with non-Apple products.
Click the [Details] links for more information about that line.
Click the [Adware] links for help removing adware.
Hardware Information: ℹ️
    15" MacBook Pro with Retina display, discrete NVIDIA graphics (Late 2013)
    MacBook Pro - model: MacBookPro11,3
    1 2.5 GHz Intel Core i7 CPU: 4-core
    16 GB RAM Not upgradeable
        BANK 0/DIMM0
            8 GB DDR3 1600 MHz ok
        BANK 1/DIMM0
            8 GB DDR3 1600 MHz ok
    Bluetooth: Good - Handoff/Airdrop2 supported
    Wireless: en0: 802.11 a/b/g/n/ac
    Battery Health: Normal - Cycle count 8
Video Information: ℹ️
    Intel Iris Pro
    NVIDIA GeForce GT 750M - VRAM: 2048 MB
        Color LCD spdisplays_2880x1800Retina
        Thunderbolt Display 2560 x 1440
System Software: ℹ️
    OS X 10.10.2 (14C109) - Time since boot: 17:0:59
Disk Information: ℹ️
    APPLE SSD SM0512F disk0 : (500.28 GB)
        EFI (disk0s1) <not mounted> : 210 MB
        Recovery HD (disk0s3) <not mounted> [Recovery]: 650 MB
        Macintosh HD (disk1) / : 499.10 GB (381.15 GB free)
            Core Storage: disk0s2 499.42 GB Online
USB Information: ℹ️
    Apple Internal Memory Card Reader
    Apple Inc. BRCM20702 Hub
        Apple Inc. Bluetooth USB Host Controller
    Apple Inc. Apple Internal Keyboard / Trackpad
    Apple Inc. Display Audio
    Microsoft Microsoft Optical Mouse with Tilt Wheel
    Dell Dell USB Keyboard
    Apple Inc. Apple Thunderbolt Display
    Apple Inc. FaceTime HD Camera (Display)
Thunderbolt Information: ℹ️
    Apple Inc. thunderbolt_bus
        Apple Inc. Thunderbolt Display
Gatekeeper: ℹ️
    Mac App Store and identified developers
Kernel Extensions: ℹ️
        /Applications/Parallels Desktop.app
    [loaded]    com.parallels.kext.hypervisor (10.1.2 28859 - SDK 10.7) [Support]
    [loaded]    com.parallels.kext.netbridge (10.1.2 28859 - SDK 10.7) [Support]
    [loaded]    com.parallels.kext.usbconnect (10.1.2 28859 - SDK 10.7) [Support]
    [loaded]    com.parallels.kext.vnic (10.1.2 28859 - SDK 10.7) [Support]
Startup Items: ℹ️
    ciscod: Path: /System/Library/StartupItems/ciscod
    MySQLCOM: Path: /Library/StartupItems/MySQLCOM
    Startup items are obsolete in OS X Yosemite
Launch Agents: ℹ️
    [loaded]    com.cisco.anyconnect.gui.plist [Support]
    [loaded]    com.oracle.java.Java-Updater.plist [Support]
Launch Daemons: ℹ️
    [running]    com.cisco.anyconnect.vpnagentd.plist [Support]
    [loaded]    com.microsoft.office.licensing.helper.plist [Support]
    [loaded]    com.oracle.java.Helper-Tool.plist [Support]
    [loaded]    com.oracle.java.JavaUpdateHelper.plist [Support]
User Launch Agents: ℹ️
    [loaded]    com.citrixonline.GoToMeeting.G2MUpdate.plist [Support]
    [loaded]    com.google.keystone.agent.plist [Support]
User Login Items: ℹ️
    Flux    Application (/Users/[redacted]/Applications/Flux.app)
    iTunesHelper    Application (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)
    Dropbox    Application (/Applications/Dropbox.app)
    Alfred 2    Application (/Applications/Alfred 2.app)
    Google Chrome    Application Hidden (/Applications/Google Chrome.app)
    BetterTouchTool    Application (/Applications/BetterTouchTool.app)
Internet Plug-ins: ℹ️
    MeetingJoinPlugin: Version: Unknown - SDK 10.6 [Support]
    SharePointBrowserPlugin: Version: 14.4.7 - SDK 10.6 [Support]
    QuickTime Plugin: Version: 7.7.3
    JavaAppletPlugin: Version: Java 8 Update 31 Check version
    Default Browser: Version: 600 - SDK 10.10
User internet Plug-ins: ℹ️
    CitrixOnlineWebDeploymentPlugin: Version: 1.0.105 [Support]
Safari Extensions: ℹ️
    1Password [Installed]
    Open in Internet Explorer [Installed]
3rd Party Preference Panes: ℹ️
    Java [Support]
    MySQL [Support]
Time Machine: ℹ️
    Skip System Files: NO
    Mobile backups: ON
    Auto backup: YES
    Volumes being backed up:
        Macintosh HD: Disk size: 499.10 GB Disk used: 117.95 GB
    Destinations:
        TimeMachineBackup [Network]
        Total size: 1.92 TB
        Total number of backups: 15
        Oldest backup: 2015-01-11 18:24:44 +0000
        Last backup: 2015-01-30 13:01:55 +0000
        Size of backup disk: Excellent
            Backup size 1.92 TB > (Disk size 499.10 GB X 3)
Top Processes by CPU: ℹ️
        15%    WindowServer
         6%    prl_vm_app
         4%    Google Chrome
         3%    Safari
         3%    prl_client_app
Top Processes by Memory: ℹ️
    893 MB    prl_vm_app
    567 MB    idea
    447 MB    Finder
    395 MB    prl_client_app
    326 MB    WindowServer
Virtual Memory Information: ℹ️
    2.55 GB    Free RAM
    6.92 GB    Active RAM
    4.39 GB    Inactive RAM
    3.31 GB    Wired RAM
    27.59 GB    Page-ins
    3 MB    Page-outs
Diagnostics Information: ℹ️
    Jan 29, 2015, 08:47:06 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/QuickLookSatellite_2015-01-29- 204706_[redacted].crash
    Jan 29, 2015, 08:45:43 PM    Self test - passed
    Jan 29, 2015, 02:48:07 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/p4v_2015-01-29-144807_[redacte d].crash
    Jan 29, 2015, 02:39:13 PM    /Library/Logs/DiagnosticReports/p4v_2015-01-29-143913_[redacted].hang
    Jan 28, 2015, 02:00:38 PM    /Library/Logs/DiagnosticReports/App Store_2015-01-28-140038_[redacted].hang
    Jan 27, 2015, 04:51:03 PM    /Users/[redacted]/Library/Logs/DiagnosticReports/Google Chrome_2015-01-27-165103_[redacted].crash

1. Power off the router. Unplug it from the wall. Wait a while.
    Plug it back to the wall. Power the router on. Wait until all the lights are lit properly. It will take a while.
    Restart the computer.
    Start up in Safe Mode.
    http://support.apple.com/kb/PH14204
2. Deselect Proxies if selected.
   System Preference > Network > Advanced > Proxies Tab
   Under "Select Protocol", uncheck any box if selected.
   Click "OK" then "Apply”.

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