Have a 1811 running 12.4.6T6. It's been running just fine for the last two years.
WLAN was initially configured via SDM. Most everything else was config'd via CLI.
Lately, when I bring up SDM to modify WLAN config, no config appears in SDM for the WLAN config (no SSID's appear, no security parameters appear, etc). New (v2.4) SDM has been installed. All other config appears OK in SDM (routing, interface configfs, IPSec, etc).
Any clues ??