Similar problem but I can reproduce 100% reliably on my system: 
Mint 13 Maya with Mate (downstream distro of Ubuntu Precise)

Slight twist on bug:  My Mate Session freezes when i perform a specific
copy to clipboard sequence.  Double clicking a record per original bug
is okay.  Regardless, answers to prior questions from Post #9:

1.  I did not have libmono-system-runtime2.0-cil installed.  I installed
it, no difference.

2.  To reliably freeze my entire Mate session:  
      a.  Open keepass, open a password record, select text from a field and 
right-click / copy.
      b.  Go to another window and paste.  
      c.  Observe that nothing happens - right click paste in context menu is 
disabled - buffer seems empty.
      d.  Go back to keepass and close the password record.
      e.  Right click said record and select from context menu "copy password".
      f.  Bang.  My system is locked.
      g.  I can reproduce this 100% of the time.  If I religiously avoid 
manually copying text from within a record, and only use the summary view right 
click copy feature, then it seems nothing evil happens.  Very hard to resist 
though - i have completely screwed myself half a dozen times and lost large 
amounts of work due to this bug.

3.  I just learned that for some reason mouse/keyboard input is
completely blocked (cursor still visible) except for:  ctrl-alt-f1 to
change run level, and alt-F2 run program.

Thankg god Alt-F2 works, because this has allowed me to sniff around
enough to learn that keepass shows up in mint as a process named "cli".
If I kill this process - life returns to normal!!!

FYI over the last months, i have tried to find the keepass process but
failed - i only discovered the "cli" process from comparing PS outputs
before and after running keepass.  So i'm very happy now because I will
never again lose all my work due to this bug - can kill "cli" now.  :)
Hope this helps someone out there avoid work loss, and I hope this helps
to figure out a solution.

Hondo  :)

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https://bugs.launchpad.net/bugs/1116512

Title:
  Double-clicking password entry from overview freezes entire system

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