Synchronize files to bring up the Synchronize window. A list of files will show up in the preview window. Right click on any file that needs updating and "Show differences".
The software will hang for a LONG time before bringing up the text differences window.
These are the exact steps I used to produce the issue:
1. Click on the Project Explorer tab.
2. Click on a project.
3. Right click and deploy app.
4. Synchronize window shows up showing a list of files.
5. Right click on any file that need updating.
6. Click on Show Differences.
This is where it hangs. The files I work with range in anywhere from 1K to 150K. The 1K files takes a few seconds to compare. The 150K files takes longer than 5 mins (I gave up after 5 minutes).