Flash upgrade plugin problems?

I have recently had some strange problems with Flash. I am teaching in a high 
school using the Adobe package. This easter holiday the problems started.
 I created some small movie clips which were to function as animations on roll 
over buttons. The first I made was, fine, the two next I made acted strange. 
Whatever I had placed outside the scene, to get it animate over the scene, was 
also suddenly visible outside the scene when the movie playd. That didn't look 
very nice when placed into the main scene.
 When the HTML file was running in IE or Firefox, it acted strange. It wouldn't

allow my file to run because of active x-controls. I had to click several times

to open it. When opened, the animation wouldn't run before I had clicked even 
another time.
 I also found a folder called script, with a script file inside. It was inside 
a folder I just had created, so it was certainly nothing I had created.
 Another problem is that the Norwegian characters suddenly dissapears, when I 
start Flash again, they are back.
 I am using Flash 8.

 What are these problems all about?
 Today I talked with the computer system manager at our school. He ment that 
the reaseon of the problem was upgrades from Adobe, plugins not working 
correctly.
 I tried my files on the computers at my school, same problem. I also built a 
simple little animation with a ball starting outside the screen, moving to the 
other side, also outside the screen. It was all visible - also on my schools 
computers.

 If the problem is new plugins from Adobe, I guess that most of the Flash world

out there has simular problems.

 Can anyone say some wise words about this problems?

 Thanks in advance!

 Sol