I'm using 1.5.2 and I couldn't get it to work either.
So I worked on something else for 15-20 mins, and I checked the folder of images in my ftp account, and voila!
New thumbnails had been created.
Now all is working well - and it should work in 1.5.3 as well, as there were only minor updates in 1.5.3.
So - the key to this little tag is -patience -
I've added numbers instead of imagenames by using
{ImageGallery picFolder="uploads/images
/" bigPicCaption="number" thumbPicCaption="number"}
NOTE : You must have a closing slash mark
after the name of your image folder!
Now, if anyone has worked out how to get proper CAPTIONS, I'd really love to know that.
The only instruction is:
bigPicCaption = "file" (filename including extension)
So - what does that mean? We create a new file like
images-captions.html?
Do we create a new file with
all the image names and their captions?
Or
one new file per caption?
How should the file look?
Any tips at all?
Hmmm - or say the image is called
photo-hawaii-01.jpg, do we make a text file called
photo-hawaii-01.txt - and type the caption inside that file, and upload it into the same image folder as the photo?
I'll test that and see if it works

Thanks!