This seems to have rather slipped under the radar. The upper floor of the Charlton Centre has been opened up as an art gallery containing studios, exhibitions, displays and ultimately work for sale. Access is at the rear of the Centre by the car park, one needs to find the toilets and head up the stairs there. It can't be accessed from the stairs in the min hall of the Centre which are still closed off.
Best of luck to these artists, it's good to see someone creatively investing in Dover even if ultimately turns out to be only temporarily.
Details can be found here (you'll need to copy and paste the link):
http://whitenave.co.uk/index.php?option=com_frontpage&Itemid=1