Javascript Error then Plugin doesn't insert

I have a problem on a site that I'm building. I get the following Javascript error when I try to insert a plugin:

I have tried deleting the WinCache file and also have tried making sure the behaviours panel isn't visible but this doesn't help.

After clicking the OK button repeatedly until it clears I then try adding the plugin.

I then get the following error:

I then get the Javascript error again, press OK lots of times and then nothing gets inserted.

Sometimes I get this error as well:

If you clear the winfile cache and do this on a new blank php page do you still get the error?

I'll have to debug this with you directly. I can't imagine what the cause might be since I haven't seen it before. If it only happens on this particular page then maybe you can send me the page so I can reproduce it and debug it independently, otherwise I'll need a US phone number or Skype contact information to set up a screen sharing session to look into it.

Hi Ray

It happens on a few of my pages, but they are all very similar/duplicates of each other

The pages have quite a few plugins in them.

Would you need the plugin pages as well?

I have provided Skype, FTP Details and also the page location in the Private Message area

I found a bug when using a plugin that has a repeat selection server behavior applied... after adding it you can't add another plugin without errors.

I've fixed the problem if you reinstall the extension it should go away.

I Ray

I removed the extension, downloaded from the Webassist website and reinstalled, now I get this error..

Then restarted Dreamweaver and now get

Sorry about that... I had a typo on that line. I'm not sure why I didn't see that error in my testing... I've done another update, please try again.