>>>>I am not going to fix all other forms, unless I'll get a task for that, though.
>>>
>>>So you have changed it to the syntax I suggested (which was the one I know).......
>>>I'm going to look at the docs and see if I can find any reference to your previous version.
>>
>>Right. Although I took that suggestion from StackOverflow where I also asked that question and who eventually helped me to find the culprit :)
>
>Looked again at the docs but cannot see anything that implies your old method was working. OTOH I did find an example here:
>
>http://stackoverflow.com/questions/16529825/angularjs-ngclass-conditional
>
>See the answer with 15 points....

Yes, that's the syntax that matches ours. Although not clear why it was implemented this way in our case.