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This also happened with 4.2.2 and it still happens with 4.2.3.
If debugger is stopped (due to a crash or on-demand) while the code is running in dependent assembly (class library), it locks its .mdb program database what blocks any further deploying and breaks the Intellisense. I can see that devenv.exe is keeping the mdb file handle opened.
I must close/reopen the VS (or MonoDevelop) each time it happens.
Windows 7 x64
VS 2010 ultimate
MonoDevelop 18.104.22.168 for Windows
Mono for Android 4.2.3
This isn't/wasn't a bug in Mono4Android, it is/was a bug in MonoDevelop.
I thought I had fixed this, but jpobst recently found/fixed the code to properly dispose the mdb files.
Unfortunately this commit didn't seem to make it into 22.214.171.124