Don't mean to high jack this thread, but, have been looking for this awhile. When I go into my calendar on my iPad there is not a "+" sign in the bottom right hand corner.
Let's start with the basic fixes, and if they don't work there are a few other things you can try. Hopefully I'm not just repeating things you already know and have tried.
When you have problems with an app it's a good idea to clear it from RAM.
Close/Clear the app: With the problem app closed, double tap on the Home button to get the multitask bar. Tap and hold on any icon in the bar until they jiggle, then tap the minus sign on the problem app. This will remove it from RAM and insure a clean start the next time you launch the app.
If that does not work try a restart,
Restart: Hold down the power button until the power off slider appears. Slide it off. When the iPad finishes shutting down, hold down the power button again until the Apple logo appears.
and then a reset if that does not work.
Reset: Hold down the power and home buttons until the Apple logo appears. The iPad will reboot. This usually takes a bit longer than a restart.
And here is a link that might help you in the future, when you have a new question to ask.
http://www.ipadforums.net/new-membe...-creating-posts-starting-new-threads-how.html