If something in ArcMap should be working and isn't there are a couple cuprits that crop up regularly.

• First check out %AppData%\Roaming\ESRI\Desktop10.X\ArcMap\Templates\Normal.mxt. Back that file up and delete it.

If that doesn't help sometimes when installing an ArcMap add-in it won't overwrite an old install correctly. From what you've described I'd say this is what's happening when you rolled back to the old version.

• Go to %LocalAppData%\ESRI\Desktop10.X\AssemblyCache there will be a whole bunch of folders named after the UIDs of your installed add-ins, find the one for your add-in, delete the whole folder and reinstall the old version of your tool. See if that helps.

Update: The AssemblyCache folder is a hidden system file. You can access it by either showing hidden system files in the Windows folder options or typing the folder name into the address bar.

For specific issues you'll need to post code relating to that issue.

If something in ArcMap should be working and isn't there are a couple cuprits that crop up regularly.

• First check out %AppData%\Roaming\ESRI\Desktop10.X\ArcMap\Templates\Normal.mxt. Back that file up and delete it.

If that doesn't help sometimes when installing an ArcMap add-in it won't overwrite an old install correctly. From what you've described I'd say this is what's happening when you rolled back to the old version.

• Go to %LocalAppData%\ESRI\Desktop10.X\AssemblyCache there will be a whole bunch of folders named after the UIDs of your installed add-ins, find the one for your add-in, delete the whole folder and reinstall the old version of your tool. See if that helps.

The AssemblyCache folder is a hidden system file. You can access it by either showing hidden system files in the Windows folder options or typing the folder name into the address bar.

For specific issues you'll need to post code relating to that issue.

If something in ArcMap should be working and isn't there are a couple cuprits that crop up regularly.

• First check out %AppData%\Roaming\ESRI\Desktop10.X\ArcMap\Templates\Normal.mxt. Back that file up and delete it.

If that doesn't help sometimes when installing an ArcMap add-in it won't overwrite an old install correctly. From what you've described I'd say this is what's happening when you rolled back to the old version.

• Go to %LocalAppData%\ESRI\Desktop10.X\AssemblyCache there will be a whole bunch of folders named after the UIDs of your installed add-ins, find the one for your add-in, delete the whole folder and reinstall the old version of your tool. See if that helps.

For specific issues you'll need to post code relating to that issue.

If something in ArcMap should be working and isn't there are a couple cuprits that crop up regularly.

• First check out %AppData%\Roaming\ESRI\Desktop10.X\ArcMap\Templates\Normal.mxt. Back that file up and delete it.

If that doesn't help sometimes when installing an ArcMap add-in it won't overwrite an old install correctly. From what you've described I'd say this is what's happening when you rolled back to the old version.

• Go to %LocalAppData%\ESRI\Desktop10.X\AssemblyCache there will be a whole bunch of folders named after the UIDs of your installed add-ins, find the one for your add-in, delete the whole folder and reinstall the old version of your tool. See if that helps.

Update: The AssemblyCache folder is a hidden system file. You can access it by either showing hidden system files in the Windows folder options or typing the folder name into the address bar.

For specific issues you'll need to post code relating to that issue.