@eris i don’t know how to disable/enable proc_open. Is it a PHP command? I searched on this forum and internet and i was not able to answer this question. Please tell me.
Anyway, i solved the same problem in another way (adding new paths to open_basedir PHP CLI settings). I explained in detail here: Panel Error after 1.4.8 update - #8 by caos30 for anyone who maybe has the same problem in the future.
Thanks in advance by your response!