Someone linked a Pale Lavender Ioun stone in General chat; I noticed it didn't have a suppressed power. The oddity was that s/he claimed to have found it yesterday.
I happened to be on my mule and, lo and behold, my ioun stones (pink, inc. blue, pink/green) were also lacking a suppressed power message... (I can only assure you I have not been hoarding legacy ioun stones just for kicks. Murlynd's spoon is where I draw the line.)
Most of the ioun stones on the AH today have a "suppressed power" note except for some that were posted recently (duration > 2 days).
I haven't seen any posts/threads on this topic, and there is no mention in the release note/know issues. Display bug only?
Update: Feather_of_Sun confirms this is a display bug only, 2 players (#11, 17) so far have reported being able to unsuppress an ioun stone affected by the issue. Apologies for any panic that may have ensued among fellow hoarders.