[ESS] Trailing slash deleted from find-file prompt

[Brendan.Halpin]

There is an intermittent problem that I have been observing for a year or two, using ESS:

After some time, or some action, in ESS, and I think only in R-mode, the find-file prompt loses its trailing slash, and if you want to complete you need to insert it by hand.

I suspect this is due to a re-definition of default-directory by ESS. 

Am I the only one encountering this?

Any ideas how to debug?

Brendan
-- 
Brendan Halpin, Department of Sociology, University of Limerick, Ireland
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