Watchdog Reset on v0.9 but not v1.0

[tpillera]

I am running the same code on v0.9 and v1.0 ESP8266-12 module. Configuration is as follows:

ESP8266WebServer server(80);

//Our ESP8266-12E is an AccessPoint.
WiFi.mode (WIFI_AP);
WiFi.softAP(ssid, password, channel);

...
server.handleClient();

I've had this code running fine on both units for a long time but due to some recent changes (not sure what) on the version 0.9 hardware I get a watchdog reset as soon as I connect to the device,

Jan 8 2013,rst cause:4, boot mode:(3,6)

wdt reset
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
vffffffff
~ld

ets Jan 8 2013,rst cause:4, boot mode:(3,6)

wdt reset
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
vffffffff
~ld

ets Jan 8 2013,rst cause:4, boot mode:(3,6)

wdt reset
load 0x4010f000, len 1384, room tail 8
chksum 0x2d
csum 0x2d

This is a new batch of NodeMcu ESP-12 modules. I have an older version of the same module that does not exhibit this problem.