That seems really odd. Not sure why Tidypics would conflict with the profile page. Are you going to the same URL from the Members page with Tidypics off and on?

Yes, and I think it's odd, too.  It affects both Profiles and Dashboard the same way -- blank page.  All others work as expected.  Disabling TidyPics brings both Profiles and Dashboard back.  I could put Admin in one browser window and a profile or Dashboard in the other, then enable and disable TidyPics while refreshing the other browser window and see the same result each time (so I know it was the same URL).

I'm not getting any PHP error log entries, just blank browser windows.

@dan - do you have any other non-default plugins that are enabled while testing this?

I'm confused, so is version 1.7.1 for elgg 1.8 ???

No. As Cash has said before, there will be no official Tidypics release for Elgg 1.8 until after the release of Elgg 1.8.1.

@Tom, Sorry it took so long to reply!  That led to a solution very quickly.  It seemed to be a cascade of things, but what it came down to was using include() instead of include_once() in a customized section.  Apparently a custom mod was suppressing the error message, though I can't think why it would do that looking at the code.  When I disabled that mod, I saw the error showing that I was trying to redeclare a function so it was a matter of finding the file and fixing the include statement.

Bottom line is that now everything is working -- custom mod, Tidypics, profiles, and Dashboard.

Thanks very much for the suggestion.