The problem at hand is:
Attempt to select a multileader (any multileader in my drawing) and I get the spinning wheel of wait for at least 20 or 30 seconds-which is an eternity.
I should note, this was not happening in my drawing until I copied in a polyline from a coworkers drawing.
did unexpected linetypes or text styles suddenly show up also? if so possibly you've been infested with DGN Bloat?
Yes, That's exactly what happened. I took corrective measures by downloading the autodesk hotfix: AutoCAD_2013_2014_DGN_Hotfix.zip
I followed the readme instructions for this solution and was able to purge 900+ dgn linetypes, but I still have the delay problem when selecting any multileader. I have ran dgnpurge, purge, audit several times.
Thanks for your quick response by the way.
Problem solved. I just realized I was so focused on it being a linetype problem I didn't purge out the text styles....duh.