I put together a quick template with some markup and CSS from a static site I was working on just to throw in the basic fields, content areas and the gallery. It worked. No firebug errors. I am really liking ImageGallery and after I pick around a bit with customizing the templates and output I think it will be just what the doctor ordered for my end users. Thanks for putting together a great module.
So for my part I think it was just something about the tutorial template. I ran that and didn't get any firebug errors either, so still not sure what was going on there.
On a side note, I would be curious to hear why you feel MODx is like a Taurus. Not really looking for a this vs that as I think that tiresome and there is enough of that around. God knows I have read enough comparisons before jumping in this pond. They both seem to be on equal footing to me just better or worse at specific tasks. I am not looking to get into Silverstripe to ditch MODx. I still plan on using MODx I just don't think one CMS is the answer for every site. Right tool for the job and all that.
I have not been digging in Silverstripe long enough to speak really for or against it.
With MODx I think its a very flexible and unbelievably easy to create a strict validating site that is very SEO friendly. Working with their powerful TV's and bindings makes my life easy. If I say want a new image field in the CMS all I do is create a TV and assign it to a template with the tick of a box. Being able to quickly assign a image widget to this field that allows for adding alt tags, assigning classes, and all that is very easy. Overall I think the templating process is quicker than with Silverstripe. Although I like how Silverstripe has a theme with templates in it where MODx is just kinda a bunch of templates that get assigned to pages.
I went looking into Silverstripe because I felt that creating a blog with advanced features is needlessly difficult and there was no great image gallery module that I felt was good for my end users. Maxigallery is great and is very flexible, once you add in phpthumb you can do just about anything with it. It just doesn't have a module interface in the backend which is a no-go for me in many scenarios.
I really like the Silverstripe community and documentation compared to MODx. You can often feel left out in the cold with some of the docs there. I also think the Silverstipe CMS from a end user experience is superior. I do not like however, that I have to open 3 files and flush the cache to put in a new field. I also don't like that urls don't reflect nested pages. I know that last bit is being fixed.
Working as mostly a front end developer and designer that is my perspective on this. I am sure you are much more knowledgeable about the inner working and advanced functionality of these systems than I. It would be great to hear if you had a few simple reasons you don't think MODx is for you, outside whats in comparisons out there. As I don't think any of them really put one ahead of the other, but I may be missing something as I know there is a lot I don't know. I am always looking to learn something new!