Bug in RKWard 0.3.3
One fairly important bug went unnoticed, when preparing the 0.3.3 release. An important file did not get installed, and this will lead to RKWard being unable to find its plugins. Fortunately, this can be worked around by simply installing one additional file.
Download this file. It needs to be installed to $prefix$/share/apps/rkward/standard_plugins.pluginmap, where $prefix$ is the directory you specified as --prefix when running ./configure. So, for example, for debian, it has to be installed to /usr/share/apps/rkward/standard_plugins.pluginmap
Sorry about the inconvenience.