I created some custom icons for folders. In windows explorer, they all show up properly on both the directory tree on the left, and window on the right. In Dopus, it shows on the left side directory tree, but not on the right side windows. I am using Dopus v8.2.2.4 Unicode
I tried rebooting Dopus (and the system too), no difference. Also tried steps recommended by one of the threads about rebuilding icon cache using TweakUI, no difference.
The tab icon thing is a known limitation. I'm not sure if it has been sent to GPSoft officially so I'll file a report now to make sure it gets looked at when there is time.
I'll also suggest that the Generic Icons option is turned off by default when people install Opus. It seems to trip up a fair few people and, with icons now read in the background, I think it should be something people enable if they need it, rather than on by default.