When exporting text as SVG, text fields that contain InDesign's "Indent to here" (see symbol in the .indd document in the background) result in a box with a blue question mark in the browser. Control click on this box and opening the "image" in a new tab reveals the error message "PCDATA invalid Char value 7".
I'm pretty sure that this wasn't a problem a few weeks or months ago. It's also not a problem when exporting text as images.
I'm sorry that you're getting an error with SVG text. I'd be happy to take a look.
Would you be able to send us your InDesign package (File > Package...) for us to troubleshoot here: