5
'tis solved now sjoroos!
in the side-bar jump-to menus (custom blocks), their forms needed to be named, ie the following needed to be added (see between ** in first line below)
furthermore, the "</select></form>" did not exist in one of the jump-to menus and this too might've caused it.
<form method="get" *name='menuform'*><select name='sitetopic' onchange='location="{X_SITEURL}"+this.options[this.selectedIndex].value'>
<option>----</option>
<option value='modules/news/index.php?storytopic=14'>film</option>
<option value='modules/news/index.php?storytopic=15'>live music</option>
<option value='modules/news/index.php?storytopic=16'>visual arts</option>
<option value='modules/news/index.php?storytopic=17'>food / drink</option>
<option value='modules/news/index.php?storytopic=18'>fashion / style</option>
<option value='modules/news/index.php?storytopic=19'>clubs / parties</option>
<option value='modules/news/index.php?storytopic=20'>galleries / museums</option>
<option value='modules/news/index.php?storytopic=21'>community / city events</option>
<option value='modules/news/index.php?storytopic=22'>performing / literary arts</option>
<option value='modules/weblog/index.php?cat_id=2'>Blog</option>
<option value='modules/newbb/viewforum.php?forum=2'>Forum</option>
<!--<option value='modules/agendax/index.php?op=cat&id=4'>Events</option>-->
<option value='modules/xcgal/index.php?cat=2'>Photos</option>
<option value='modules/ms_weather/index.php?op=MSWeatherDecode&pcity=London'>Weather</option>
<option value='modules/xdirectory/viewcat.php?cid=1'>Directory</option>
<option value='modules/myAds/index.php?pa=view&cid=1'>Classifieds</option>
</select>
</form>