Which version of MOBAC did you use before ?
Because support of WMS 1.3.0 in Custom WMS map sourcesxml files comes with version 2.2.3 of MOBAC (thanks to Nicolas Paour - http://randochartreuse.free.fr )
It is really important (mandatory....) to always run testing on latest rev of softs.
BTW, which version of OruxMaps are you testing ?
Because support of WMS 1.3.0 in Custom WMS map sourcesxml files comes with version 2.2.3 of MOBAC (thanks to Nicolas Paour - http://randochartreuse.free.fr )
It is really important (mandatory....) to always run testing on latest rev of softs.
BTW, which version of OruxMaps are you testing ?