Thanks for this report and for taking the time to check out debug mode and re-install the plugin. The warning message and line number information is particularly helpful. I am sorry this is giving you trouble.
The message comes from a function that is building the "where-used" information ("Gallery in" and "MLA Gallery in") for the Media/Assistant table listing. It looks like one of your
[mla_gallery] shortcodes is returning an error instead of an array of attachments. The current version of MLA does not handle this error properly, causing the warning messages. I will fix that in the next version.
In the interim, you can try a few things to correct the problem or at least suppress the messages. First, have you added or changed any
[mla_gallery] shortcodes that might not be working properly? Are the galleries displaying what you expect?
Second, you can go to the Settings/Media Library Assistant screen and change the "Where-used Reporting" options. Try setting the "Gallery in" option to "Disabled" and see if the problem goes away. If so, the
[gallery] shortcode is causing trouble. If not, try changing the "MLA Gallery in" option. If that suppresses the messages,
[mla_gallery] is the culprit.
There might be some other defect in the MLA plugin that's causing this problem, even if your shortcodes are working fine. If you want it, I can fix the code and send you a copy that more clearly identifies the source of the problem. If that would help, send me your e-mail address; go to the "Contact Us" page at our web site:
Fair Trade Judaica/Contact Us
Let me know what you'd like to do. Thanks again for your interest and for bringing this issue to my attention.