There's a discussion in the German Lazarus forum (
http://www.lazarusforum.de/viewtopic.php?f=2&t=11123) that the language settings of the IDE (Tools > Options > Environment > General > Language) is lost when a Laz trunk is updated by fpcupdeluxe.
I checked this with a fresh installation (Laz trunk & fpc trunk, created by fpcupdeluxe on Win10), set language to "Default (or english)", and updated by fpcupdeluxe), and in fact, the language is set back to "English".
I know from my daily work when I update Laz trunk via svn that this does not happen. So, is this caused by fpcupdeluxe?