The _filedir() function in acroread's (at least Linux) bash completion file conflicts with the one from the bash completion project, http://bash-completion.alioth.debian.org/ - the one in acroread ends up overriding the one in the latter with an implementation that is not compatible/does not meet expectations of various completions from the bash completion project, thus breaking them in subtle, hard to debug ways.
Please consider renaming the _filedir bash function shipped in acroread's bash completion file to for example _adobe_filedir (or inlining it in _acroread) to resolve the issue.
