This problem is driving me mad every time I copy and paste etc I get this message and
it causing weird effects over my illustration
If anyone can help I would be grateful
What message and weird effects do you mean?
Basically the message which keeps coming up in a panel is Applying Art Brush every time I try to copy and paste
I have attached a screen shot and you will see
Also when I have been copying and pasting and this message comes up at times I am getting great brush strokes and panels of colour appearing over my illustration
Apart from that, without taking a look at a sample Illustrator file I can only guess that for whatever reason some pretty complex art brushes (probably with a lot of anchor points) are being reapplied to some rather complex paths.
It might just be normal that it takes some time to process, therefore the progress bar is appearing.
I get what you are saying but I don't understand why this message 'Applying Art Brush' would pop up
when I am not doing any colouring with the Art Brush, just copying and pasting the illustration.
I was colouring with the brush but that was over 3 hours ago
Did you reboot the computer since then? Maybe that clears up a few things.
If it doesn't, please show us before and after pasting (the weird strokes that appear).
Better yet as Kurt Gold already asked: upload the file so one might take a look at it in Illustrator.