For the last week I've noticed random red X's appearing on my SMS messages. The messages are sent and received just fine and the red x goes away if I go back to the main messages page and then back into the thread. This doesn't happen on all messages and I can't seem to replicate exact when it will appear.
I only have SBSettings, Mobile Scrobbler, 3G unrestrictor, and ultrasnow installed on my phone through Cydia. Never had these appear on any previous iphone (jailbroken or not), although this problem hadn't occurred prior to me jailbreaking the iphone 4.

Here's a screen capture of what i'm referring to. The boxes also turn a slightly lighter shade of green.

Anyone else run into this? cause? fix?