[CS5][XSL] InDesign crashes on dynamic selection...

Question

If I have any code like:
<xsl:variable name="selectStr"><xsl:text>/Some/Path/To/Nodes</xsl:text></xsl:variable>
combined with either of these:
<xsl:variable name="selectNodes" select="$selectStr" />
<xsl:for-each select="$selectStr">
     <!-- Some XSL stuff -->
</xsl:for-each>
results in InDesign crashing. The selectStr can be anything. I have tried many things.
The only thing I can think of is that it is not automatically parsing the string to a node-set.
Others seem to be getting a "result must be a node-set" with other parsers (not InDesign).
Also it crashes reguardless of having the <xsl:text> elements in the first variable.
Anyone know of a way to do this without crashing?

Answer 1

Thanks Peter, Since posting the first question I've realised my mistake of not installing properly in the first place!! very annoying... I'm going to try and uninstall and re install the whole suite I think. Does that sound like the right thing to do?
Many Thanks