[TYPO3-dev] Plugin blank after upgrade to Typo3 4.0 [SOLVED]

[Francois Suter]

Hi,
> I'm having the same issue randomly with certain TYPO3 4.0 installs. Some 
> plugins will render fine and others won't even include the _pi1.php 
> script at all. Shifting the plugins to another installation often causes 
> it to work.

I found the solution. It wasn't directly related to my extension, but to 
my update process from Typo3 3.8.1 to 4.0. Some extensions have been 
"promoted" to system extensions, including css_styled_content.

I din't pay attention to that, which meant that my v4.0 install was 
still using the local copy of css_styled_content. Removing it (both via 
the EM and physically from the server) allowed me to install the newest 
(system) version. After that my extension worked perfectly with Typo3 v4.0.

It's a rather sneaky problem, since when you try getting a new version 
of such extensions from the TER, you don't find them (which is the whole 
point, but it still causes some confusion). So you think your install is 
up to date, but in fact it isn't.

Cheers

-- 

Francois Suter
Cobweb Development Sarl - http://www.cobweb.ch