Container field weirdness

[Pete]

I have container fields in my DB which store MS Word files. These files act as templates which are modified and saved to a new file by 360Works Scribe

One of these containers is misbehaving. 

I have 2 files, call them A and B. Depending on the context, either A or B is loaded into a global container field called gContainer2

Whatever I do, this field always contains file A, even though it says it contains file B. 

If I manually drag file B to the field, it shows an icon called file B, but if I export it again and open it, it is file A.

By the way,  this same process is used with another container field called gContainer1, which works perfectly. There is no difference in the attributes of the two fields.

Any help much appreciated

Pete