When I start MT4 it deletes sKVM-BTC-Import_v1.2.ex4 from ~/.wine/drive_c/Program Files (x86)/MetaTrader 4/experts/...
As far as I have read:
http://forum.mql4.com/56320"This problem seems to be related to the build 507! There have already been a number of posts about it already!"
So try a newer build or reinstall it!