there seems to be a serious bug in rs.Plugins() eg. when the status is set to zero (0 means to list both loaded or unloaded plug-ins) it does not list a single plugin name. Even when many are loaded or unloaded:
import rhinoscriptsyntax as rs
for p in rs.Plugins(types=0, status=0):
print p
same error occurs if only the status argument or both optional arguments are omitted like below:
import rhinoscriptsyntax as rs
for p in rs.Plugins():
print p
c.