Hi
I have been running into this issue whereby the Delete / Compare buttons no longer swap. Its happening in Firefox and IE on a number of sites. I believe it started after moving to WP 3.0.1, but cannot confirm.
Workaround:
In \wp-content\plugins\revision-control\revision-control.php, around line 615,
<input type="button" class="button-secondary toggle-type"
value="<?php esc_attr_e('Delete', 'revision-control') ?>"
id="revisions-delete" style='display:none' />
remove
style='display:none'
to give you
<input type="button" class="button-secondary toggle-type"
value="<?php esc_attr_e('Delete', 'revision-control') ?>"
id="revisions-delete" />
That will show the Delete / Compare buttons all the time, but it will get you by for now.
And many thanks to dd32, the Author for such a great plugin.