Nothing has changed in software to change the way this is handled, so it must be the way you have the unit set up, or a glitch on your unit.
Before going any further, can you just clarify what you meant when you said you "get a voice alert telling me the distance and speed limit using the computer voice,"
Do you mean that happened WHEN YOU APPROACHED A SPEED CAMERA?
Assuming that's so, then there are two alternatives.
If you are using TomTom's OWN speed camera data (downloaded from them), then AFAIK there ISN'T a way to get voice warnings unless you add recorded audio files of your own, and even then you cannot get the speed limit announced (as you can only assign different sounds to different camera TYPES, not speeds).
However, if you are using a third-party speed camera database (using the POI system on the TomTom) then you CAN have the "text to speech" voice give the warning of an up-coming POI.
There are a couple of limitations though... You can only do that if:
a. you have selected a TTS voice for your navigation instructions, or
b. you selected the TTS voice to do warnings etc. if you chose the non-TTS voice for navigation, and
c. you have also ticked the box in "Voice preferences" for "Read aloud POI warnings".
What you can get the TTS voice to say, depends on the camera type and speed details being in the filenames for the POI files (or you laboriously typing in your own warning text), but alternatively you can have voice warnings from audio files you have added yourself.
Those can obviously say whatever you like... including warning noises followed by a voice alert giving camera type and speed limit.
In the UK, the PocketGPSWorld camera database has several optional sets of voice alerts you can install and use.
Let us know if any of that rings any bells, or if you want help to take any of the options further.