https://www.icyphoenix.com/viewtopic.php?f=26&t=7021&p=48598#p48598
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Mighty Gorgon
Fri 02 Apr, 2010 08:52

Re: Only Png Mid Thumbnails Cached, No Jpg Thumbnails
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I thought I had already fixed that... :roll:

Anyway I might be wrong, because I'm not working on FAP for phpBB any more. I'm sure I have fixed that in Icy Phoenix FAP.

Since it seems you are good with PHP, should you need something else about thumbnails or album you can try to have a look at Icy Phoenix album code which includes an enhanced version of the old FAP.

Glad you solved your issue.