Justflight installtion problems

[cpt nick]

Im trying to install my addons but on FScene and Traffic (Justflight) after the screen where you select which sim you want to install it in, and it's supposed to go to the EULA acception page, it just minimised with the tab named 'preview' and when i maximise it nothing maximises. but the tab is 'depressed' like the program is maximised, if you know what i mean.
I dont know why its doing this, ive had no problem with other installtions, especially British Airports.

any suggestions I could try?

Thanks guys