This is not a bug. The old way of passing variables is obsolete. Please refer to http://docs.limesurvey.org/URL+fields#Passthrough_fields_LimeSurvey_2.x_or_later_

Carl -- thanks for the quick followup. Using new 2.00 methodology results in similar problem. profile and sur defined as parameters in Panel Integration and assigned to no question(s).

Then survey start url is used like this:
index.php/survey/index/sid/66549/lang/en?profile=12345&sur=555

Text elements end url code (Edit Survey --> Text Elements) is set to:
complete.php?pe={PASSTHRU:profile}&sr={PASSTHRU:sur}

Redirect URL is returned like this:
complete.php?pe=&sr=

Additionally, the placeholder {SID} consistently returns 0 when used like this
complete.php?ss={SID}&pe={PASSTHRU:profile}&sr={PASSTHRU:sur}

Returns:
complete.php?ss=0&pe=sur%7D notice missing second & and trailing ~

It's Carsten.

Please attach a sample survey as .lss file. Thank you.

Carsten -- 243k lss file attached. Thanks. Not sure what planet "Carl" came from...

Sidenote of interest: when I save params, then go edit a question, and return to Panel Integration, params are gone. Checked database, and they are there, but if you save Panel Integration again (when empty) existing params are, of course, deleted since the new Save action posts an empty set. Problem exists whether or not question assignments are made.

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=9636

Thank you. All issues should be fixed in the next 2.00+ build.

Thanks Carsten. 3,200+ questions and still loving the taste of Lime.

New version 2.00+ build 121005 released.