max/msp5

Derek Pierce's icon

I have a patch which uses several vst plugins,I have the following problems.
When i double click on one vst plugin its image comes up as a tiny slither of a box which cannot be used.
Sometimes the other plugin a compressor doesnt load.
A third vst plugin a reverb load perfectly ok.
All these vst are in the same folder and the orginal 4.5 version worked well.Can any body help please