On re-reading your post-
Did you leave the dish in the RGV? If so it is probably ok unless it got moved slightly.
Was the receiver disconnected while you were in Canada. If so it has definitely lost its authorization.
Did you reactivate your programming before heading south since you use Bell up here.
If so, it may just need a rehit to activate your programming.- you can use the internet- I believe.
Check the Shaw site for this.
Again- Shaw is now unable to help you if you are in the USA.
This has changed since last year when they were very helpful.