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Created attachment 3579 [details]
On Windows 7 x64, Xamarin Studio 4.0, build 2003
I experienced the same problem as https://bugzilla.xamarin.com/show_bug.cgi?id=10558, and the fix described there fixed the "not being able to start" part of the issue. However, after creating a new project and typing anything, as soon as autocompletion is triggered (both manually and automatically), an error pops up, rendering code editing impossible. The autocompletion list is not shown. The log also displays some other error, but that's not shown inside the editor and doesn't seem to cause any errors that I can detect.
Seems you're mixing 4.0 and 4.0.2 assemblies - 4.0 shouldn't have a PlainText property there - but 4.0.2.
Something got messed up with your xamarin studio installation - which version are you using ?
The "official" version from the monodevelop home page (http://monodevelop.com/Download).
Can't repro it - have you done a clean install ? This bug occurs when a wrong dll is loaded.
Created attachment 3582 [details]
Complete reinstall with redownloaded installers. Vanilla install (eg. didn't copy over DLLs from other bug) results in Xamarin Studio not starting, same error message as the one I experienced at first. Log attached.
Also, I forgot to mention that the error message is identical to the one in the bug report I linked with the exception that parts of mine is in my native language, Hungarian.
Try this, it includes the fixes from the linked report:
Unfortunately the links on monodevelop.com have not been updated yet, but that should be fixed soon.
Yes, it seems that this was the issue, that update fixed it! While I'm still here, I'd like to mention that the Xamarin Studio installer from http://xamarin.com/download also downloads 4.0, the incorrect version.