Thread:Project:Support desk/Cannot upload files since the update from 1.22.7 to 1.23./reply (2)

Hmm, the first use of popen was in REL1_3 in GlobalFunctions.php: https://github.com/wikimedia/mediawiki-core/blob/REL1_3/includes/GlobalFunctions.php

The FSFileBackend (since REL1_20) was created with the use of popen: https://github.com/wikimedia/mediawiki-core/blob/REL1_20/includes/filebackend/FSFileBackend.php

So, if you have an error message, so wen can see, in which file the popen fails, then we can look into it, when this was introduced, but i think it was before 1.22.