IBM Connections 5.5 fix installation – a moment of panic and how to solve it

I installed the required fixes ( 5.5.0.0-IC-Multi-IFLO87330, 5.5.0.0-IC-News-IFLO87487, 5.5.0.0-IC-Common-IFLO87469, 5.5.0.0-IC-Multi-UPDI-20151224 ) in my Connections 5.5 installation.

After doing this, I log in to Connections and I see this

As you can imagine I had a moment of panic. Why on earth has the UI reverted back to 5.0 ?
Thanks to the excellent Charlie Price of IBM I found the solution: go in C:\IBM\WebSphere\AppServer\profiles\AppSrv01\temp and delete everything in there; clear your browser cache and at the next log in everything will be back to normal 🙂