diff --git a/src/xminigrid/experimental/img_obs.py b/src/xminigrid/experimental/img_obs.py
index 759bf0a..cc854b4 100644
--- a/src/xminigrid/experimental/img_obs.py
+++ b/src/xminigrid/experimental/img_obs.py
@@ -14,6 +14,7 @@
 from ..wrappers import Wrapper
 
 CACHE_PATH = os.environ.get("XLAND_MINIGRID_CACHE", os.path.expanduser("~/.xland_minigrid"))
+FORCE_RELOAD = os.environ.get("XLAND_MINIGRID_RELOAD_CACHE", False)
 
 
 def build_cache(tiles: np.ndarray, tile_size: int = 32) -> tuple[np.ndarray, np.ndarray]:
@@ -47,7 +48,8 @@ def build_cache(tiles: np.ndarray, tile_size: int = 32) -> tuple[np.ndarray, np.
 TILE_SIZE = 32
 
 cache_path = os.path.join(CACHE_PATH, "render_cache")
-if not os.path.exists(cache_path):
+
+if not os.path.exists(cache_path) or FORCE_RELOAD:
     os.makedirs(CACHE_PATH, exist_ok=True)
     print("Building rendering cache, may take a while...")
     TILE_CACHE, TILE_W_AGENT_CACHE = build_cache(np.asarray(TILES_REGISTRY), tile_size=TILE_SIZE)
@@ -80,7 +82,7 @@ def _render_obs(obs: jax.Array) -> jax.Array:
 
 class RGBImgObservationWrapper(Wrapper):
     def observation_shape(self, params):
-        return params.view_size * TILE_SIZE, params.view_size * TILE_SIZE, NUM_LAYERS
+        return params.view_size * TILE_SIZE, params.view_size * TILE_SIZE, 3
 
     def reset(self, params, key):
         timestep = self._env.reset(params, key)