QuickUpdate works fine and so does QuickCreate->Document.
I tried the compress_js suggestion but no difference.
When I tried the browser cache and cookies, the following happened (odd to me but perhaps to you MODX exports it's obvious): Before I cleared the cache and cookies, I still had the new resource open for which I tried to change the template but where it reverted back to the default template. However, after browser cache clearing, I refreshed the MODX resource page and it suddenly reverted back to the new template I had tried to change it to earlier! However, if I try to save this now, I get the following error message:
An error occurred while duplicating the resource.Array ( [pagetitle] => Test [longtitle] => [description] => [introtext] => [template] => 3 [alias] => [menutitle] => [link_attributes] => [hidemenu] => 1 [published] => 0 [id] => [type] => document [context_key] => web [content] => [create-resource-token] => 4f68cb1321f677.88569791 [reloaded] => 1 [parent] => 0 [parent-original] => 0 [parent-cmb] => [class_key] => modDocument [content_type] => 1 [content_dispo] => 0 [menuindex] => 0 [publishedon] => 0 [pub_date] => 0 [unpub_date] => 0 [isfolder] => 0 [searchable] => 1 [richtext] => 1 [cacheable] => 1 [syncsite] => 0 [deleted] => 0 [uri_override] => 0 [uri] => [tvs] => 1 [tv5] => [ta] => [tiny_toggle] => 1 [action] => create [modx-ab-stay] => [resource_groups] => [] [HTTP_MODAUTH] => modx4f19326159c161.17706526_14f68cb4a51cc58.32314673 [donthit] => 0 [createdon] => 2012-03-20 18:28:11 [createdby] => 1 [publishedby] => 0 )
I guess it has something to do with browser cache clearing? Anyway, I thought I'd put it up anyway, just in case it helps.
Thanks though, BobRay, for your suggestions!