The Visual Studio forms designer only writes out resource values to
the language specific resx files if the value is different from the
invariant.   So provided you don't open the designer in say French and
move controls around, the control positions should not get written out
to French.   Unfortunately because of the way the designer remembers
the last language edited, it is very easy to accidently open a form
(not realizing that it is language specific) and then make changes
that result in the control positions being saved.  Unfortunately
Visual Studio doesn't provide any easy way of resetting these langauge
specific resources back to the invariant value once this has
occurred.   You basically have to edit the resx.

You might be interested in taking a look at Infralution's
Globalizer.NET product.  This makes the whole process of localizing
forms and controls much easier.   You can choose to just localize
certain types of resources (eg strings and icons).   Globalizer.NET
will then generate the language specific resx files for you -
eliminating the frustration you are currently having.   You can get
more information and download an evaluation version from
www.infralution.com/globalizer.html

Regards
Grant Frisken
Infralution