Block-Type-Settings were inaccessable (Upgrade related?)

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Hey guys,

I experienced some possible misbehaviour after upgrading from 5.5.? to 5.6.0.2 I'd like to discuss with ya:

My Block-Types in settings were inaccessable today.

I did some minor changes to the C5-CSS (editmode: outlines instead of borders) right before I noticed my block-type-settigns were inaccessable (JS returns only "<div>").

After browsing around the forums, I found this thread:
http://www.concrete5.org/community/forums/installation/update-to-5....

As you can read there, it seems that the upgrade progress (executed by dashboard) leaves behind a line like this in site.php:
<?php define('DIRNAME_APP_UPDATED', 'concrete5.6.0.2');?>


As told in the thread mentioned above (even if it was in different context), I removed this line from site.php and it seems to work just fine now.

My questions are:
- What is this line for? Does it activate the upgrade?
- Have I just partially rolled-back the upgrade? (seems so)
- Why were all the C5-Files coming from the upgrades/ folder before?
- This is not a solution, is it?!

Thanks! :)

SlapY