My linestyles are defaulting, firstly to "centre 2" and now to "dashed" despite the linetype being selected as "continuous"  in layer manager.I am having tocreate the linework in the apptopriate layerselect one of the lineschange it's linestyle in "Properties"Use this line as the source in "Match Properties"Match the property to all the other linework in the layerAny help greatly appreciatedThanXHarcX  

Sounds like somewhere it is being overridden probably on the Ribbon > Home tab > Properties panel.  Look at where it lists Linetype.  Instead of being set to 'ByLayer' it is probably set to a specific linetype.  Change it back to 'ByLayer'.
John Connor2014-09-12 13:43:01

You can also type the name of the responsible System Variable, CELTYPE [which stands for Current-Entity LineTYPE], and it will tell you what it is [presumably your different problem linetype], and give you the chance to tell it to go back to ByLayer.
 
But if it had been using one "wrong" linetype but then a different one, I suspect something is changing it for you, probably some specialty function(s) you're running, that should be changing it back but fail to do so.  Next time you notice it, investigate whatever non-native-AutoCAD function you used recently that involves any other-than-Bylayer linetype.  If it's an AutoLISP routine, it can be fixed to ensure that it sets the current linetype back to ByLayer, or if you prefer, to whatever it was [even if other than ByLayer] when the routine was started.

Thanks John,I seems to work. So simple when you know howCheersHarcX

Thamks Kent,I will keepnote of your suggestions in case Johns' idea has conniptions.If only Dynamic Blocks were so simple!!!CheersHarcX