What version of ALLPlayer are you using, do you have latest 6.0?
Please redownload latest version and install it, there was an update (new build) of ALLPlayer v6.0 with some fixes about subtitles.
You may also want to check out unstable beta version 6.1 with another changes and fixes about codecs and subs, read here:
viewtopic.php?f=21&t=2834 (automated translation:
https://translate.google.com/translate? ... 26t%3D2834 ).
As it's beta there may some things not work at all but we need more testers and we appreciate help in finding bugs.