Attempt to workaround concurrent issue
Attempt to workaround concurrent issue

This problem (CheckFiles=2) happens when:
1) Remodel is displayed;
2) The game requests swf of the first ship twice;
3) Resource swf is available locally so Plugin sends 2 requests with Last-Modified;
4) Both requests return from KC server with 304;
5) One of them gets all the way to OnAfterSessionComplete, and since TaskRecord contains it, the file is being updated;
6) When the file is being updated (deleted but not written), the second request comes through and either
  a) dies in OnBeforeResponse due to FileNotFound,
  b) dies in OnAfterSessionComplete when updating file time, due to FileNotFound.

CAWAS/EOPlugin-LocalCacher