I can't help you without the debug file. Sorry. :-/
I would have to install the OpenATV that you own - I don't know which one, but I assume that the official OpenATV 7.4 has already been released (it is no longer just a development version). Then next I have to start debugging on this installed image.
But I guess that the error will be somewhere in upgrading the OpenATV 7.4 develop version to the new (full) released 7.4 version.
If I remember correctly, the developer versions use different directories for plugins. After you update to the official version, these old directories will remain there. And maybe that's the problem. That the upgraded official OpenATV can no longer find the plugin in the right directory. And now I'm just guessing the cause of the possible problem. I don't know if that's true. Maybe reinstalling the plugin or checking that there is a proper "plugin.py" file (i.e. module) and path to it would help:
# INSTALL - the latest released version of the plugin:
# (Warning ! The plugin configuration will be deleted !)
wget -qO- --no-check-certificate "https://github.com/s3n0/e2plugins/blob/master/ChocholousekPicons/online-setup?raw=true" | bash -s install
# or:
curl -LJs "https://github.com/s3n0/e2plugins/blob/master/ChocholousekPicons/online-setup?raw=true" | bash -s install
Also, the need for the ".py" / ".pyo" / ".pyc" files present may be different for the development version and for the official released version. The develop version should contain all of the listed ones (I'm not sure, but it probably does).
/////////EDIT:
So I'm adding info !
The official version of OpenATV 7.4 has not yet been released. ONLY version 7.3 is still available for download - as stable / released version. OpenATV 7.4 version is intended for testers and not for novices and amateurs ! As of today, version OpenATV 7.4 has still not been officially released.
If you are using version OpenATV 7.3, then you probably did something wrong, because in my case (Chocholousek Picons 5.0.231225), with my OpenATV 7.3 (up to date) everything works OK.
I repeat again that I need a debug file from you. Otherwise I won't find the error. The error should be / will be recorded in more detail in the debug file.
However, I still think that you are using the 7.4 version intended for developers / testers ... and there is a small problem in it.