Hi guido p
If you want to try my solution again, all you need to do is as follows:
(Note: it is important to use the actual Macintosh (in this case, your 2007 MBP 3,1 or whatever Mac is at issue) as the machine driving the Mavericks installer in what follows.)
1 - Get an empty/erased external HD (USB or FW is fine) - make sure it's a GUID-partition table HFS+ drive.
(If you only have half a drive, just partition it - you'd probably get away with 25GB or so, but go a lot more if you have it.)
[NB - You could even partition your internal HD if necessary. I guess the install would be a fair bit slower, but if you have the space, it should work fine. However, only do this if you have nothing external, because after the clean install described below, you'll want to migrate everything, so your HD needs to be big. In fact without an external HD I reckon somewhere you'd get jammed - unless, for example, you have a custom very-large HD in your old MBP.]
2 - Boot from your 10.8.4 or any modern stable OS - even 10.6 is fine.
3 - Make a spare copy of the Mavericks installer somewhere (so that you have 2 copies - the first copy tends to delete itself at the end of the install process, unless you have moved/copied it somewhere)
4 - Run a clean install of Mavericks onto that external drive/partition. (Choose it as the destination by clicking 'show all hard drives' in the relevant installer screen.)
5 - If the install goes ok, boot from that Mavericks drive. Make sure that you don't have an ethernet cable connected!
6. You will probably get the Apple setup wizard now - i.e. iCloud account, wifi network password etc. Fill that in, but postpone the use of migration manager.
7. This is probably all you need to do to get Mavericks stable. (I made the mistake at this point of switching wifi off to test the bug - and the bug bit me again.)
8. Now (assuming you have a full SuperDuper/CCC backup of your stable OS and your user accounts) run Disk Utility and wipe your internal drive (or the main partition, anyway).
9. Clone from the external Mavericks drive to the Internal drive.
10. Reboot, holding down option key and selecting the internal drive.
11. If all OK, remember never to connect ethernet or turn off wifi.
12. Run migration manager and bring over your old apps and accounts from your SuperDuper clone (or Time Machine or CCC).
13. KEEP your old stable-version backup. Never erase it! You don't yet know how many overheating issues are still to come, and you might one day hang the system by mistake - even if just turning off wifi when in an unusual wifi area or to save battery.
14. Backup your new mavericks internal HD on a fresh partition/drive using SuperDuper.
You should be set to go. I would also suggest installing a thermometer monitor and keeping an eye on your CPU temperatures. They are very revealing.
NB - I won't be pushing my old MBP 3,1 very hard. I have several newer Macs. But I worry about those of you using it as your main/only laptop. I think the risk of overheating on anything above Snow Leopard is high. (Snow Leopard runs incredibly cool. No other OS goes near it.) But at least Mavericks has smart energy and CPU management software. See here for tips.