Have recently upgraded to Mavericks. Since then, I have been unable to upload images to a photo lab in Melbourne - what is wrong?

Question

I work as the photographer in a small Photography studio and we use a Lab in Melbourne to retouch and print our photographs for our clients.  This Lab (Nulab) has software downloaded to my Mac from their website which I use to upload the images, request certain finishes & retouching for each file.  However, in the last week, I have not been able to export these images to them in Melbourne - it creates a folder on their end and then tries to communicate back to my end, but it obviously hits something and therefore won't upload the images to their folder. 
Before it stopped working, I had upgraded to the new Mavericks, I had callibrated my computer & redownloaded the software from our lab's website.  Nothing else has changed.  I have been through everything I can think of (security settings, Firewall, Antiviruses - disabling and uninstalling, reinstalling Lab software) as well as contacting the lab and their IT man looking into it having remote control of my desktop.  We are both unsure of what has happened. 
Can anyone help?

Answer 1

Let me make two suggestions before offering something to try;
1. Never upgrade unless you know that your mission critical software is compatible.
2. Never be without at least two separate backups. You are a business. Backups are essential.
Try these in order testing your system after each to see if it's back to normal:
1. a. Resetting your Mac's PRAM and NVRAM
    b. Intel-based Macs: Resetting the System Management Controller (SMC)
2. Restart the computer in Safe Mode, then restart again, normally. If this doesn't help, then:
     Boot to the Recovery HD: Restart the computer and after the chime press and hold down the
     COMMAND and R keys until the Utilities menu screen appears. Alternatively, restart the
     computer and after the chime press and hold down the OPTION key until the boot manager
     screen appears. Select the Recovery HD and click on the downward pointing arrow button.
3. Repair the Hard Drive and Permissions: Upon startup select Disk Utility from the Utilities menu. Repair the Hard Drive and Permissions as follows.
When the recovery menu appears select Disk Utility. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the main menu. Select Restart from the Apple menu.
     Reinstall the 10.9.2 update: OS X Mavericks 10.9.2 Update (Combo).
4. Reinstall Lion/Mountain Lion, Mavericks: Reboot from the Recovery HD. Select Reinstall Lion/Mountain Lion, Mavericks from the Utilities menu, and click on the Continue button.
Note: You will need an active Internet connection. I suggest using Ethernet if possible because it is three times faster than wireless.
Reinstall the 10.9.2 update: OS X Mavericks 10.9.2 Update (Combo).