I can fix this.
Press the Windows Key and the R button simultaneously.
Type in "%appdata%\.minecraft\" (without quotations)
Rename "servers.dat.tmp" to "servers.dat"
Can you clarify that this bug is not present in vanilla?
I can fix this.
Press the Windows Key and the R button simultaneously.
Type in "%appdata%\.minecraft\" (without quotations)
Rename "servers.dat.tmp" to "servers.dat"