I just installed an old working copy of Aslains, copied the script file to my desktop, updated to the new version, and replaced the new file with the old file, I didn't actually edit it manually in anyway.
Not sure the rule on crossposting, but I am pretty sure this is the same issue this other guy is having which I think I figured out a work around that worked for me.
http://aslain.com/index.php?/topic/2093-stuck-in-loading-screen-with-leopard-1/?p=11023
I was having this problem too, I think I narrowed it down to matches where there is a JPE100 in the match. Your log and my log both have an identical line
All I did which seemed to fix it was use an old copy of the script file in place of the newer one. After that I could get into games with a JPE100 with no issues. This is the script I replaced with an older version (which I attached). res_mods\0.9.7\scripts\item_defs\vehicles\germany\jagdpz_e100.xml
jagdpz_e100.xml