I created a movie and did a custom overlay with only one speed gauge.
the preview was fine but after the export the gauge had a blueish color.
it looked exactly like when you select the cauge to move it around in Virb Edit.
same with a second attempt to export. I deleted the project and created a new one and the issue was gone.
no big deal as it works now, but I'm just wondering if anybody had the same issue.