Oh! I'm sorry if I misunderstood you.
When I say "same problem" I mean the "Insufficient Storage Available".
In my case, I tried to install Friendcaster with about 90MB free in internal storage and got this message. So, it's not normal I think.
Where do you see the 90MB available?
In my Settings/Apps section I can see 159MB available (on my phone) but when I go to the Settings/Apps section I can see only 51MB available.
What is the reason for that difference? What does the Apps section mean with "free" mem?
I have those questions also.