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I set the bg color to transparent but it just turns white. It was working before but now all of a sudden the transparency option there isn't working.
Could you please post screenshots with the pertinent Panels (Toolbar, Layers, Options Bar, …) visible?
Does turning off »Use Graphics Processor« in the Performance Preferences (Photoshop > Preferences > Performance > Graphic Processor Settings) and restarting Photoshop have any bearing on the issue?
There has been a report on something similar recently