When TYPO3 is installed in a subfolder, the little icons (namely icon-notchecked.png and icon-check.png) can't be loaded because their path is absolute.
See /Classes/Utility/PluginInfo.php line 74-78
Example:![1]()
it might be a better idea to change that to a path that is relative to the extension path.
See /Classes/Utility/PluginInfo.php line 74-78
Example:

it might be a better idea to change that to a path that is relative to the extension path.