Hi Marek, Have a look at this topic: http://forums.sketchucation.com/viewtopic.php?f=11&t=45382

Thank you for all the advice. Will try the plugin removal first and see what happens.

Funny you should say that.... I still don't understand what TIG means about only doing my Sketchup modelling during daylight hours ? The wierdo mad script to set the shadow clock to real time has no effect (on my iMac) to the Sketchup editor.. it doesn't go dark, I don't see glorious sunsets or sunrises...

As we have posted on the Shaderlight forum, this is behaviour that is being caused by Shaderlight. This was discovered following your initial query to Shaderlight support. This is something that we have now entered in to our system and will hopefully be resolved in a future update of Shaderlight. Any queries or questions about Shaderlight, please do not hesitate to contact us directly at support@artvps.com or on our forum at http://www.artvps.com/index.php/discuss Martin

Yeah, welcome to the forum, and please post images of your work!