WF 7715 Tracing paper causing jam

[MikeBlackboards]

Hi all. Hope somebody can help me out. Until recently i have been able to print onto 90gsm tracing paper with no problem. Today it reports a paper jam every time I try and print. I open the rear and the paper seems to have fed normally and can be removed without any problem. I am using the plain paper setting, and have tried the Matte setting but neither works. Whats changed? Help!