Server settings can be part of the issue. If the settings are restrictive then HUD fixes might be ignored or you could experience problems. Plus, Valve unfortunately roped FOV into the same situation earlier this year:
Source Engine Changes (TF2, DoD:S, HL2:DM)
* Limit the effective FOV of players using wide-screen resolutions with aspect ratios wider than 1.85:1. The sv_restrict_aspect_ratio_fov ConVar can be changed to remove the restriction or make the restriction also apply to full-screen players.
Basically, it may be impossible to play on some servers with HUD/FOV adjustments.