Dear David,

I can reproduce what you describe. I also suspect that it is probably an unwanted feature, i.e. a bug. Other formats in ExportString seem to work ok-ish.

ExportString[(1 + a)/b, "TeX"]

seems to work alright in the cloud. Importing it:

ImportString[%]

gives

The error messages say

General::stop: Further output of FrontEndObject::notavail will be suppressed during this calculation.

FrontEndObject::notavail: A front end is not available; certain operations require a front end.

FrontEndObject::notavail: A front end is not available; certain operations require a front end.

FrontEndObject::notavail: A front end is not available; certain operations require a front end.

Ops, this is strange. I just re-ran your commands in the cloud and now they give this:

which is the output I get on a Desktop as well.

Either WRI are working on this right now or I do not understand this behaviour at all.

Cheers,

Marco