Yesterday a new patch for APEX came out on My Oracle Support (Metalink). Without the patch number it was difficult for me to find the right patch, as just searching on product family Oracle Application Express didn't give the correct result. So if you want to download the patch from My Oracle Support search for patch number 8548651.
This patch includes a number of fixes:
How to install the patch and further information you find in the patch notes. After installing the patch your version of APEX should be 3.2.1.00.12.