Before installing SMSSBoost, RedGate SQL Search 18.104.22.168 (free edition) worked fine and not messed up with anything:
On the first start SSMS, buttons from SQL Search was added to the SSMS toolbar
On the second start additional buttons disappeared from SSMS Boost toolbar, but RedGate toolbar was moved to next line
And on the third start SSMS, RedGate toolbar didn't move, but additional buttons reappeared on SSMS Boost toolbar
On the fourth and subsequent runs there was alternation of the second and third start (pic.3 - pic.4 - pic.3 - pic.4...)
When I move RedGate toolbar somewhere, on the next start SSMS all ok, but on the second start SSMS RedGate toolbar was moved to second line (pic.3), on the third start additional buttons reappeared on SSMS Boost toolbar (pic.4), etc...
This strange behavior is observed only on SSMS 2012, with SSMS 2008 all worked fine.
Microsoft SQL Server Management Studio 11.0.3128.0 (MSSQL 2012 std)
Operating System 6.1.7601 (Windows7 x64 pro sp1)
RedGate SQL Search 22.214.171.124 free edition
Sorry for my English