Marketplace button often is not there when I start the program. Only seems to come up when there is a special offer or free item. During the last special offer, I actually went in and bought a texture pack. Works fine, but saw others that I want to try. I cannot get back to the Marketplace until the button shows up again.
Not sure how long it has been doing this as I did not care before I wanted to buy something. But I've noticed it for a few weeks at least.
I have not tried to reboot.
Solved
Had a hunch that I checked out.....The Clear Vanilla (Default) texture pack removes the button. I tested another texture pack to make sure it was still there, and it was. So it is this particular texture pack.
You can close the report. I did not see an option to do it myself
Thank You