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You are missing the CSS code for the slider that will style it.

If you have “Enable WooCommerce CSS” checked in the General WooCommerce settings page, it should show up.

If you are doing custom CSS styling, you need to style the slider elements.

Here is a slightly modified version of the WooCommerce default price filter CSS:

/* =Price Filter Widget
	-------------------------------------------------------------- */
.widget_price_filter .price_slider {
  margin-bottom: 1em;
}
.widget_price_filter .price_slider_amount {
  text-align: right;
  line-height: 2.4em;
  font-size: 0.8751em;
}
.widget_price_filter .price_slider_amount .button {
  font-size: 1.15em;
}
.widget_price_filter .price_slider_amount .button {
  float: left;
}
.widget_price_filter .ui-slider {
  position: relative;
  text-align: left;
}
.widget_price_filter .ui-slider .ui-slider-handle {
  position: absolute;
  z-index: 2;
  width: 0.9em;
  height: 0.9em;
  -webkit-border-radius: 1em;
  -moz-border-radius: 1em;
  border-radius: 1em;
  border: 1px solid #141741;
  cursor: pointer;
  background: #2d338e;
  outline: none;
  top: -0.2em;
}
.widget_price_filter .ui-slider .ui-slider-handle:last-child {
  margin-left: -0.5em;
}
.widget_price_filter .ui-slider .ui-slider-range {
  position: absolute;
  z-index: 1;
  font-size: .7em;
  display: block;
  border: 0;
  background: #c0132c;
  -webkit-border-radius: 1em;
  -moz-border-radius: 1em;
  border-radius: 1em;
}
.widget_price_filter .price_slider_wrapper .ui-widget-content {
  -webkit-border-radius: 1em;
  -moz-border-radius: 1em;
  border-radius: 1em;
  background: #d5d5d5;
}
.widget_price_filter .ui-slider-horizontal {
  height: .5em;
}
.widget_price_filter .ui-slider-horizontal .ui-slider-range {
  top: 0;
  height: 100%;
}
.widget_price_filter .ui-slider-horizontal .ui-slider-range-min {
  left: -1px;
}
.widget_price_filter .ui-slider-horizontal .ui-slider-range-max {
  right: -1px;
}

That should get you started!

That most likely has to do with conflicts with scripts or other plugins…I would recommend opening up Firebug or something simlar and tracking down which scripts may be interfering or causing errors that are preventing portions of the AAM to work correctly.

You may want to try deactivating all other plugins to see if that removes the conflict and if it doesn’t, try switching your theme back to twentyten, twentyeleven, or twentytwelve to see if it is possible that your theme is causing the error.

Hope that helps!

I have found a workaround that will at least allow you to use the plugin again with WP 3.5. If you are receiving a white page when trying to access the Access Manager, try the following:

Open up Plugins > advanced-access-manager > view > css > wpacess_style.css and remove the display:none; from #aam_wrap.

That did the trick for me and I was off and running again.

Hope this helps