@Nicholas-Smilek3917 I would guess a fix will probably take months or will not be released until the next major version. They just started development again after nearly two years. ACID was put on the back burner because Magix probably doesn't have the manpower.
I ran into this same problem with EZDrummer 2 as well as Superior Drummer 3 when working with Acid Pro. I'm guessing since I don't own EZD3.....but it's likely the same problem.
What you may notice is that all ToonTrack Plugins are currently VST3 plugins. What I noticed is that all my other VST3 instrument plugins install with a ".VST3" file extension for the plugin, where ToonTrack's plugs install with a ".DLL" file extension instead. By default, they get installed to your PC's "C:\Program Files\Common Files\ VST3\" plugins folder.
For some reason Acid Pro seems to have a problem with the the different file extension and being located in the default VST3 plugin folder but Reaper doesn't as mentioned.
So how to get it to work?
1. Navigate to your VST3 plugin folder : "C:\Program Files\Common Files\ VST3\"
2. Find the EZDrummer3 plugin file
3. Copy or move that file to your VST2 64bit install plugins folder, typically located at C:\Program Files\VSTPlugins\ or C:\Program Files\Steinberg\VSTPlugins\ (ie which ever folder you have Acid setup to scan for 64bit VST2 plugins).
4. Restart Acid. Acid will go through a re-scan of your plugins and EZDrummer will now load and function correctly.
I don't visit here often since I've moved onto other DAW programs but may fire up Acid via re-wire from time to time if working with loops. This should likely be stickied to the top of the forum, if Magix isn't going to get around to fixing the issue. I responded to a few other posts in the past with the same issue of ToonTrack plugins not working in Acid after I had the same problem and eventually figured out how to solve it.
I recently received an ACID Pro 10 Update and was hoping t6hat they addressed the issue with ACID's issue with EZDrummer3 but no luck. I have no clue what they think that have fixed but it certainly was NOT their VST3 issue regarding EZDrummer 3. Considering that I have only had ACID Pro Suite for lass than 6 months before all of these issues with EZD3. I am going to seek for a refund and move to Reaper. I suggest you all do the same.