stucco and humidity
It's hard to tell what's going on. Sure, I could see how you'd lean towards thinking that the current 'finish job' has affected the moisture level.
Try putting a dehumidifier in there to see if that helps. It may work enough to let you complete the job. This is better than taking a chance in that the 'finish job' from last year is the cause.
My best to ya and hope this helps.
Jay J -Moderator