I'm running mIRC 6.16 with nnscript 3.81 on XP Pro SP2.
With WindowBlinds 4.5 everything was skinned fine. I've just upgraded to 4.51 and now there is a problem with the custom tool bar that nnscript provides.
The following image shows what the toolbar looks like when WindowBlinds is disabled, i.e. What the toolbar should look like:
http://www.whitman.nildram.co.uk/wb-disabled.png
The next image shows what the toolbar looks like when WindowBlinds is enabled. Something goes very wrong:
http://www.whitman.nildram.co.uk/wb-enabled.png
I realise it could be a problem with nnscript but considering it worked fine with WindowBlinds 4.5 I doubt it.