Saved in the single player campaign couple of weeks back, just went to continue and although i see my saved game it just says 'Unable to load' when i click on it.

Any ideas of a fix to this, dont want to start over again.

Was this a mid-mission save? Unfortunately updates will often invalidate these save files. Saves on the campaign map should be fine though. You may need to go back a bit to a previous autosave.

is there a way to load skirmish saves against AI? After every update the progress is gone and sometimes you cannot play for hours just to finish one skirmish?