I noticed something strange today. If you go to Apple Menu > System Preferences > Language & Text [that's how it's called in Lion] > Text 

a text substitution table appears, where you can create your own auto-corrections. Thus typing "aaa" will give me the whole Icelandic alphabet:
a, á, b, d, ð, e, é, f, g, h, i, í, j, k, l, m, n, o, ó, p, r, s, t, u, ú, v, x, y, ý, þ, æ, ö 

The problem is, that this does not seem to work in Nisus. This works as expected in TextEdit. I just don't know, if this has always been like that, or whether this is an indication, that something is broken by me.

Could somebody be so kind and check this for me. 
Thanks.

Þorvarður
 OS X 10.7.5
 MacBook Pro 17''