Can Not Select SliceA for xmit

Flex 6700 ssdr 1.0 On 10m opened slice on 28.3500 and made contact. Opened another slice down on 28.032. Moved around some on the cw part until I found someone I wanted to call. Select sliceB for xmit. All worked. Panadapter shows Slice A out of view to the right. Double click on the SliceA box and that takes you back to 28.350 but now cannot select xmit for that slice. If I look at the Panadapter it shows SliceB out of view to the left with tx. As I try to select Xmit in Slice A the xmit indicator for B goes away but no xmit for A. I have to x out slice B in order to get slice A to xmit. I haven't tried other bands etc. and I've been off the air for a few days so don't know if anyone else has reported. tnx Roger