I upgraded from 2.1.6. to 2.2.1; had a fine, working page with basically no extra plugins or modules (just FormBuilder).
However, I do use a number of content blocks and have them assiged first like:
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{content block='Technische Daten Rot' tab='Technische Daten' Label='Technische Daten Rot' assign='techred'}
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{if ($techred!='')}{$techred}{/if}
Now I wanted to change some text in the main content area of a page, applied the change (contents of that extra blocks were totally fine displayed in Tiny) and found that the contents from the extra content blocks were now suddently 'missing'? Actually, it writes "0", literally. In the Tiny as also on the front end.
In the database the contents still is there. Where am I going wrong? Typo in the template perhaps? There are no umlauts or such ... perhaps the whitespaces(?) - but, that's only the Label...
All right; never mind.
The whitespaces in the block='' were the issue, as far I can see right now. At least new updates are beeing saved and remain. For some reason I had no problems with that in 2.1.6.
I'll just leave this post here for other guys running into these kind of problems: Check first if you use umlauts or other t¥pó you didn't think of - like whitespaces.