I have about 20 different plugins installed and active but only 7 of them show up in the widget menu under plugins. Is there a configurable setting in b2evo that changes this or could it perhaps be a database issue? I'm running 2.4.5 and I'm positive that at least 17-18 are compatible with 2.4.5.
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20 plugins that make widgets? If a plugin doesn't make a widget it won't show up in the widget list is the thing.
Anyway to the best of my knowledge there is no limit on how many widget-making plugins will show up in the appropriate part of the widgets tab.