Dmg file and finder issue

Hi,
Since I have upgraded my Macbook pro to Yosemite I have experienced several issues each time I have install/upgrade an application (.app file) from an dmg file.
Example with calibre application from http://calibre-ebook.com/download_osx
or google chrome.
I have downloaded the latest version, then open the dmg image by double clicking on it (Because I have unchecked the default option "Open safe file after downloading" in Safari), but impossible to drag and drop the new app file in the Application folder. No error message is displayed.
If I try to unmount the dmg file, then I get an error message.
The only workaround I have found is to perform a Force/Relaunch of the Finder. Then everything is working fine!
Any idea how to avoid this issue or is it just a bug?

Double-clicking on a disk image (.dmg file) mounts the image (treats it like inserting a disk) and puts a disk icon on your desktop. Once this is done, you may treat that icon in most every respect as a disk (it's common to make read-only images, so you might not be able to write/copy files to it).
In the case of installing an application, there are two basic procedures on a Mac:
1.) Double-click on a package icon (looks like a stylized cardboard box) and a wizard will guide you through the process much like Windows users experience.
2.) Find an icon for an application, and drag it to /Applications (click on the icon for it and hold the button down while you move it). If you don't have the Applications folder open, you can simply drag the icon onto the Macintosh HD icon and hold it there for a couple of seconds, then window will open and you'll see the Applications folder where you can drop the file (onto the Applications folder icon).
To eject the disk image, simply click on the icon for the mounted image, and press command-E (E for 'eject'), right-click or control-click on the icon and select 'Eject' from the pop-up menu, or drag the icon into the trashcan on the dock.
After you've unmounted the disk image, you can do whatever you like with the disk image file.

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