Experts/indicators files - .ex4 getting erased

 
I don't know if you notice this or not. There seems to be a BIG problem with MetaTrader 4 Terminal erasing .ex4 files with no .mq4 source after getting a Live Update (and some cases without getting updated).

Please fix this bug urgently as it is an extremely critical issue to have the indicators/experts suddenly disappear!!!

Thank you in advance.
 
ex4 are erased if compilator version is changed. this problem cannot be fixed because obsolete executables should not be executed. please save yourself your executables (but i think obsolete executables are useless)