iCal Self Deleting Events

Apple listen up and listen good ...

It is spectacularly frustrating the over the past month or so iCal colours keep changing.

This is a bug that should have been permanently solved within hours of discovery.

BUT .. tonight I have discovered that events are self deleting.

That is massively unacceptable.

Trust me, I know how to use iCal and I have been using Macs since 1985.

The exact situaiton is:

iCal on iPhone5 running OS 6.latest

iCal linked via iCloud to 3 other computers and 1 iPhone 4S none of which is manned.

and 1 MacPro (Mountain Lion latest) is on my desk and has full access to calendar.

I enter a new event and Accept it.

It appears in the MacPro calendar and then spontaneously disappears.

Let's be clear: No Way, No Way etc. Apple get on to this.

Thanks