This is really confusing me.
This morning I used the card reader in the imac to copy files, after the update the imac wont recognise my SD cards (including the one that worked this morning), they are not coming up in disk utility either. However when i take it out i get the error message saying that i never ejected it properly.
Any help would be apreciated!
Sorry was away on holiday for a few days.
Finaly got this sorted, i searched google and found someone who had a similar problem. Turns out when i restarted the imac the SD Card was mounting but when I inserted when it had already started it did not, the guy realised that the wee switch in the card reader must of been stuck and got something to put into it and swipe the switch back. Mycard was now recognised in finder but not appearing on my desktop.
i then realised why so many are having problems since update, i always had as mentioned above 'thatsfixedit' (Click on 'Finder' 'Preferences' - tick the box 'external disks') for some reason apple have now changed SD cards into the 'CDs, DVDs & Ipod' catagorey, tick that and it will reappear.
Problem solved, hope this helps others!