Image export doesn't work in Jalview 2.8.2

If you normally launch Jalview with a local JNLP file (such as one you created to customise Jalview's memory settings), then you will find that Jalview 2.8.2 cannot export images.
To fix, simply download a new customised JNLP file via the following URL:

http://www.jalview.org/services/launchApp?jvm-max-heap=1G

(change 1G to your desired memory settings - in either M or G)