Are you using latest version from extra-devel?

In addition, patch won't restore old messages (they're lost afaik), but it will let new messages come plain text in group and private chats..

To be more accurate, I noticed occasionaly some message could get lost:
- Previous Yappari version, private chat, Iphone user (anyway my contact noticed it not seeing double thick and resended successfully)
- Current Yappari version, group chat, multiple users (it happened I lost a couple messages first time when I ran patched Yappari version; since then it seems all right)